Cutter.



E. LAWRENZ.

CUTTER.

APPLICATION FILED JULY 6, 1912.

1,073,255. Patented Sept. 1 1913.

WITNESSES: INVENTOR. i Y

- MAW A T ORNEY.

unrrnn STATES PATENT carton EMIL LAWRENZ, OF DETROIT, MICHIGAN.

CUTTER.

To all whom 2'75 may concern:

Be it known that I, EMIL LAWRENZ, a citizen of the United States,residing at Detroit, in the county of Wayne and State of Michigan, haveinvented certain new and useful Improvements in Cutters, of which thefollowing is a specification.

This invention relates to cutters, and more especially to that classthereof which may be utilized in connection with last-turning machinesor the like, and it has for one of its objects the provision of acutter-head comprising a series of cutters for actin upon the block tobe turned after the rcug pr superfluous material of the same has beenremoved, so that the present cutterhead has to produce only thefinishing out which leaves nothing but the sand-paper finish and polishto be applied to the work.

The invention has furthermore for its object the provision of what maybe termed a secondary cutter-head in which a series of knives arepositioned and held so as to successively operate upon the Work andconform in the size exactly to that of the model wheel of the machine.

A further object of the invention resides in the novel means foradjusting either one or all of said knives on the head in a positivemanner so that they are held in fixed positions without any danger ofbeing displaced by centrifugal force.

Further objects of the invention will hereinafter appear and beparticularly defined in the claims.

The invention has been clearly illustrated in the drawings in whichsimilar characters denote similar parts, and in which- Figure 1 is aface view of a cutter-head embodying my invention. Fig. 2 is a' sectionon line 22 of Fig. 1. Fig. 3 is a face view of the head, per se,'andFig. 4 is a side view of one of the cutters.

In the present instance I have illustrated a cutter-head 10 adapted tohold three knives 11 11*, 11, which are substantially similar inconstruction, and each of which comprises a cutting face the contour ofwhich is round as shown at 12. The head 10 may be mounted upon a shaft13 provided with a collar 14: against which the head rests, while a nut15 in screwthreaded engagement with the outer end of the spindle may, inconjunction with a washer 16 serve to clamp the several cutters in placeon the head, and the latter in its entirety in Specification of LettersPatent.

Patented Sept. 16, 1913.

Application filed July 5, 1912. Serial No. 707,684.

contact with the collar 14:. In the present instance I have illustratedtwo of the cutters 11 and 11 as being held in fixed positions on thehead, as for instance dowel pins 17 which may be integral with anddepend from the under-side of the cutters and fit snugly into apertures18 provided in the disk for that purpose. One of thecutters (11), ismounted on the'cutter-head 10 so as to be adjustable thereon in anarcuate path to increase or decrease the distance between this cuttingedge and the center of the spindle to a precisionized position, or inother words so that. this particular cutter will be adapted to beexactly of the same radius from the center of the spindle, as the radiusof the model Wheel from its axis. The other two cutters are intendedmore for the purpose of trimming the block into shape so that only avery fine chip is required to produce a smooth or finished last. It isfor the reasons just stated that thisfinishing cutter is in the presentinstance the only one which is adapted for fine adjustment.

Owing to the great speed at which the cutters are revolved whenoperating, the means for holding the knives from being thrown outward bycentrifugal force, must be very substantial in construction, andfurthermore great care must be exercised that the several knives willalways be so positioned so as to retain the entire cutter-head inperfectly balanced condition. The particular manner in which the finalfinishing knife is held on the cutter-head is clearly illustrated inFigs. 1 and 2 in which the dowel pins carried by the shank 12 aredisposed within an arcuate slot 19 of the head, this slot being curvedeccentrically to the rotation axis of the head so that, when the knifeis swung around the center of the spindle, the dowel pins will travelalong in the slot 19, and a very fine adjustment of the cutting edge 12'can therefore be ob tained. The several knives being similar to eachother, and the positions of the dowels being also the same in each case,it follows that the knives are interchangeable and either knife may beplaced over the slot 19 to produce the final cut and be brought intoexact position by the slot construction above described. From apractical stand-point it is very undesirable that all of the knives bemade adjustable, on ac count of the extreme difiiculty in setting,

them at the same distance from the center. Furthermore these adjustableknives, While they do not do any actual finishing or sizing, Will removesuperfluous material sidewise as the Work is fed along and furthermorethey serve to balance the cutterhead' as a Whole when the latter isrotated at a high speed.

Changes may be made in the general organization and particularconstruction of the head or its component parts, especially in the shapeof the cutters and the particu lar manner of positioning and: holdingthem, on the head, without departing from the spirit of the'invention.

I claim 1. The combination with a cutter-head having sets of aperturesand; an arcuate slot eccentrically disposed relatively tothe rota:

tionaxis of the head, of a knife having a shank fitting against thehead, dowel pins carried by the shank and fitted for movement in saidslot and adapted to enter either set of apertures, and a single devicefor holding said shank against the head.

i 2. The combination With a head having sets of apertures and an obliqueslot, of a series of knives each'having a shank, dowel pins carried byeach shank and adapted to enter either set of apertures or the slot, and

means for holding said knives in contact Copies of this patent may heobtained fQI fiYG cents each, b addressing the Commissioner of Patents.

Washington, D. 0. i

